add note on zlib-ng

git-svn-id: https://svn.r-project.org/R/trunk@87637 00db46b3-68df-0310-9c12-caf00c1e9a41

doc/manual/R-admin.texi

@@ -3139,7 +3139,10 @@ Installations of @code{zlib} (version 1.2.5 or later), @code{libbz2}
 @code{liblzma}@footnote{most often distributed as part of @code{xz}:
 possible names in Linux distributions include
 @code{xz-devel}/@code{xz-libs} and @code{liblzma-dev}.} version 5.0.3 or
-later are required.
+later are required.  Some software distribtutions@footnote{for example,
+Fedora 40} replace @code{zlib} by
+@code{zlib-ng}@footnote{@uref{https://github.com/zlib-ng/zlib-ng}} which
+has an optional compatibility interface.
 
 @c PCRE[1] 8.32 is from Nov 2012.
 @c Debian Wheezy had 8.30, Ubuntu 14.04LTS had 8.31 but both are EOL.